Page 155 - Chemistry ICSE Class IX

The Periodic Table 143
(ii) The long form of the periodic table is based on
(a) molecular masses ˆ
(b) atomic masses ˆ
(c) atomic numbers ˆ
(d) mass numbers ˆ
(iii) According to the modern periodic law, the properties of elements are a periodic function of their
(a) atomic number ˆ
(b) atomic mass ˆ
(c) atomic volume ˆ
(d) mass number ˆ
(iv) Which of the following elements has the highest electronegativity?
(a) I ˆ
(b) Br ˆ
(c) Cl ˆ
(d) F ˆ
(v) The number of elements in each of the long periods is
(a) 2 ˆ
(b) 8 ˆ
(c) 18 ˆ
(d) 32 ˆ
(vi) An element with atomic number 19 will most likely combine with the element whose atomic number is
(a) 17 ˆ
(b) 11 ˆ
(c) 18 ˆ
(d) 20 ˆ
(vii) Which of the following statements is not a correct statement about the trends going from left to right across
the periodic table?
(a) The elements become less metallic in nature. ˆ
(b) The number of valence electrons increases. ˆ
(c) The atoms lose their electrons more easily. ˆ
(d) The oxides become more acidic. ˆ

Answers
(i) (c) (ii) (c) (iii) (a) (iv) (d) (v) (c) (vi) (a) (vii) (c)